<template>
  <!-- 商品分类导航 -->
  <div class="type-nav">
    <div class="container">
      <div @mouseenter="enterShow" @mouseleave="leaveShow">
        <h2 class="all">全部商品分类</h2>
        <!-- 三级分类 -->
        <transition name="sort">
          <div class="sort" v-show="show">
            <div class="all-sort-list2" @click="goSerach">
              <div
                class="item"
                v-for="(c1, index1) in categoryList"
                :key="c1.categoryId"
                @mouseenter="changeIndex(index1)"
                @mouseleave="leaveIndex"
                :class="{ cur: currentIndex == index1 }"
              >
                <h3>
                  <a
                    :data-categoryname="c1.categoryName"
                    :data-category1Id="c1.categoryId"
                    >{{ c1.categoryName }}{{ index1 }}</a
                  >
                  <!-- <router-link to="/Search">{{ c1.categoryName }}</router-link> -->
                </h3>
                <!-- 三级分类2 -->
                <div
                  class="item-list clearfix"
                  :style="{
                    display: currentIndex == index1 ? 'block' : 'none',
                  }"
                >
                  <div
                    class="subitem"
                    v-for="c2 in c1.categoryChild"
                    :key="c2.categoryId"
                  >
                    <dl class="fore">
                      <dt>
                        <a
                          :data-categoryName="c1.categoryName"
                          :data-category2Id="c2.categoryId"
                          >{{ c2.categoryName }}</a
                        >
                        <!-- <router-link to="/Search">{{
                        c2.categoryName
                      }}</router-link> -->
                      </dt>
                      <!-- 三级分类3 -->
                      <dd>
                        <em v-for="c3 in c2.categoryChild" :key="c3.categoryId">
                          <!-- <router-link to="/Search">{{
                          c3.categoryName
                        }}</router-link> -->
                          <a
                            :data-categoryName="c1.categoryName"
                            :data-category3Id="c3.categoryId"
                            >{{ c3.categoryName }}</a
                          >
                        </em>
                      </dd>
                    </dl>
                  </div>
                </div>
              </div>
            </div>
          </div>
        </transition>
      </div>
      <nav class="nav">
        <a href="###">服装城</a>
        <a href="###">美妆馆</a>
        <a href="###">尚品汇超市</a>
        <a href="###">全球购</a>
        <a href="###">闪购</a>
        <a href="###">团购</a>
        <a href="###">有趣</a>````
        <a href="###">秒杀</a>
      </nav>
      <div></div>
    </div>
    <!-- <div>{{categoryList}}</div> -->
  </div>
</template>

<script>
import store from "@/store";
import { mapState } from "vuex";
// import _ from 'lodash'
import throttle from "lodash/throttle";

export default {
  name: "TypeNav",
  data() {
    return {
      // num: 1,
      currentIndex: -1,
      show: true,
    };
  },
  mounted() {
  
    if (this.$route.path != "/home") {
      this.show = false;
    }
    
  },
  created() {},
  computed: {
    ...mapState({
      categoryList: (state) => {
        return state.home.categoryList;
      },
    }),
  },

  methods: {
    // changeIndex(index) {
    //   //  alert('11')
    //   this.currentIndex = index
    // },
    // 鼠标进入修改响应式数据currentIndex属性
    // throttle回调函数别使用箭头函数，可能出现this指向上下文的问题
    changeIndex: throttle(function (index) {
      // console.log(index,'123');
      this.currentIndex = index;
    }, 50),
    leaveIndex() {
      // alert('离开')
      this.currentIndex = -1;
    },
    // 最好的解决方案: 编程式导航 + 事件委派
    // 利用事件委派存在一些问题  ：1点击一定是A标签 2:如何获取参数【1'2级分类的产品的名字 ID】
    goSerach(e) {
      let element = e.target;
      // 节点有一个dataset属性，获取节点自定义属性与属性值
      let { categoryname, category1id, category2id, category3id } =
        element.dataset;
      if (categoryname) {
        let loction = { name: "search" };
        let query = { categoryname: categoryname };
        // 一级分类二级分类三级分类的a标签
        if (category1id) {
          query.category1Id = category1id;
        } else if (category2id) {
          query.category2Id = category2id;
        } else {
          query.category3Id = category3id;
        }
        // 判断：如果路由跳转的时候，带有params参数，捎带传递过去
        // 路由跳转
        if (this.$route.params) {
          loction.query = query;
          loction.params = this.$route.params;
          this.$router.push(loction);
        }
    
        // console.log(loction);
        

      }
    },
    enterShow() {
      if (this.$route.path != "/home") {
        this.show = true;
      }
    },
    leaveShow() {
      if (this.$route.path != "/home") {
        this.show = false;
      }
    },
  },
};
</script>

<style scoped lang="scss">
.type-nav {
  border-bottom: 2px solid #e1251b;

  .container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    position: relative;

    .all {
      width: 210px;
      height: 45px;
      background-color: #e1251b;
      line-height: 45px;
      text-align: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
    }

    .nav {
      a {
        height: 45px;
        margin: 0 22px;
        line-height: 45px;
        font-size: 16px;
        color: #333;
      }
    }

    .cur {
      background-color: rgb(192, 255, 233);
    }

    .sort {
      position: absolute;
      left: 0;
      top: 45px;
      width: 210px;
      height: 461px;
      position: absolute;
      background: #fafafa;
      z-index: 999;

      .all-sort-list2 {
        // .item:hover {
        //   background-color: skyblue;
        // }
        .item {
          h3 {
            line-height: 30px;
            font-size: 14px;
            font-weight: 400;
            overflow: hidden;
            padding: 0 20px;
            margin: 0;

            a {
              color: #333;
            }
          }

          .item-list {
            display: none;
            position: absolute;
            width: 734px;
            min-height: 460px;
            background: #f7f7f7;
            left: 210px;
            border: 1px solid #ddd;
            top: 0;
            z-index: 9999 !important;

            .subitem {
              float: left;
              width: 650px;
              padding: 0 4px 0 8px;

              dl {
                border-top: 1px solid #eee;
                padding: 6px 0;
                overflow: hidden;
                zoom: 1;

                &.fore {
                  border-top: 0;
                }

                dt {
                  float: left;
                  width: 54px;
                  line-height: 22px;
                  text-align: right;
                  padding: 3px 6px 0 0;
                  font-weight: 700;
                }

                dd {
                  float: left;
                  width: 415px;
                  padding: 3px 0 0;
                  overflow: hidden;

                  em {
                    float: left;
                    height: 14px;
                    line-height: 14px;
                    padding: 0 8px;
                    margin-top: 5px;
                    border-left: 1px solid #ccc;
                  }
                }
              }
            }
          }

          // &:hover {
          //   .item-list {
          //     display: block;
          //   }
          // }
        }
      }
    }
    // 过渡动画的样式
    .sort-enter {
      height: 0px;
      transform: rotate(0deg);
    }
    .sort-enter-to {
      height: 461px;
      // transform: rotate(360deg);
    }
    .sort-enter-active {
      transition: all 0.5s linear;
    }
  }
}
</style>